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: http://xmm.vilspa.esa.es/sas/8.0.0/doc/arfgen/node14.html
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arfgen crossregionarf=yes spectrumset=spec_output.ds
crossreg_spectrumset=spec_input.ds detmaptype=dataset
detmaparray=image200.ds
This command returns the effective area in a region of the detector
(defined in spec_output.ds) coming from the PSF
overflow of flux from the sky region defined in spec_input.ds.
The detmaparray, image200.ds, should be an image which includes both
detector regions with a pixel size which is small compared to the
size of the regions. It is recommended that the number of detmaparray
pixels which falls within the spec_output.ds region is to
properly sample the region. But please note that this calculation is
very compute intensive and very fine detector maps will lead to a
very long run time.